SHOW ME PICS OF BO/OBS FOR POINTS PLEASE

Idon’t understand this.. will someone ? will mark brainliest along with 20 points.

An automobile assembly line operation has a scheduled mean completion time, μ, of 12 minutes. the standard deviation of completion times is 1.6 minutes. it is claimed that, under new management, the mean completion time has decreased. to test this claim, a random sample of 33 completion times under new management was taken. the sample had a mean of 11.2 minutes. assume that the population is normally distributed. can we support, at the 0.05 level of significance, the claim that the mean completion time has decreased under new management? assume that the standard deviation of completion times has not changed.

Jim had 15 minutes to do 5 laps around his school what would his time be